INCOME TAXES - Consolidated (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
U.S. Federal
Current	$ (823)	$ (2,646)	$ 1,549
Deferred	(4,261)	(754)	492
Non - U.S.
Current	2,286	1,730	4,867
Deferred	(470)	1,239	(121)
Other	225	(33)	(301)
Total	$ (3,043)	$ (464)	$ 6,485